The next big update for Windows 10 has been delayed while Microsoft rushes to fix a newly-discovered bug. From a report: Known variously as Windows 10 version 1803, Cumulative Update for Windows 10 Version Next, Redstone 4 and Windows 10 Spring Creators Update, it was widely thought that the update had reached RTM and was on the verge of rolling out. However, this last-minute discovery means there will be a little longer to wait.